Generally, it is legal and ok to kill them in Texas if they're causing a nuisance or health hazard. While they are not exotic and are still technically protected from sport or fun shooting, many would consider them constantly a nuisance, and in that case, they may be controlled by killing, as approved by both state and federal law. This is summarized from state law on the TPWD website:
http://www.tpwd.state.tx.us/huntwild/wild/rehab/protected/
Wild Birds: All wild birds that migrate through or are indigenous to Texas, along with their plumage or other parts, eggs, nests and young are protected from harming, killing and/or possession by state and federal law except that European starlings, English sparrows, and feral pigeons may be killed at any time and their nests and eggs may be destroyed. A permit is not required to control grackles; cowbirds; yellow-headed, red-winged, rusty or Brewer's Blackbirds; crows or magpies when these birds are considered a nuisance or causing a public health hazard. No birds may be controlled by any means considered illegal by local city or county ordinance.
http://www.tpwd.state.tx.us/regulations/fish_hunt/hunt/nongame/
Yes, they are endangered species
If you live in the United States, it is illegal to keep grackles as pets since they are a native species.
A cackle of grackles.
is spotlighting illegal in Texas
It is illegal to kill anyone.
Yes it is illegal to kill songbirds
It is illegal to kill anyone innecont
In Texas, having a yard sale is not illegal as long as you abide by local regulations, such as obtaining any required permits and following guidelines on hours of operation, signage, and noise levels. It's best to check with your city or county regulations to ensure compliance.
Ani
Grackles are a group of noisy birds, nostly black and quite similar to the Crow family.
I think it's illegal to have neon underglow in Texas.
It is illegal to kill anyone unless it is for self defense.